Mazda RX-8 Workshop Manual page 3348

Is reception equivalent
between customer's unit and
compared unit?
NOTE:
Due to following differences,
you may feel difference in
reception efficiency.
10 Retighten ground fixation for
antenna installation part and
(Vehicle
side
factor)
Antenna
installation
location,
height,
feeder
wiring
routing,
optional
electrical
equipment
(Audio
unit/car-
navigation
unit factor)
Volume
concern
type: It
decreases
change of
volume
when signals
become
weak. (Noise
is easy to be
conspicuous)
Noise
decrease
type: It
decreases
volume
when signals
become
weak, so
that noise is
not
conspicuous.
No Go to the next step.
YesReplace audio unit/car-navigation unit.